Twitterheads: Celebrities Who Tweet

The social network changed its homepage earlier this year to feature minute-by-minute status updates, in an imitation of Twitter, which displays a real-time stream of 140-character posts from its users, with no filtering or sorting.

Now Facebook CEO Mark Zuckerberg has gotten over his Twitter envy. He tried to buy the hot San Francisco startup for a reported $500 million -- a deal Twitter rejected -- then ordered up the revamp.

Facebook now uses an algorithm to display the most interesting news, like relationship changes, photo postings, and event invitations, even if they're days old. Users had complained that important updates were getting drowned out by noisy real-time chatter.

There's still an option to view real-time updates. But why would they? If noise is what you're after, Twitter specializes in that.